Grinding device



June 20, 1939. J. EMERSON GRINDING DEVICE Filed Sept. 22, 1938 3Sheets-Sheet l INVENTOR- JOHN EMERSON iZM a v ATTORNEYS 1 "b W NW. 4 W 72U 0 .,E 5 5 w w w a x mw a 5 MR flm 1 s I W Mo a u NM w m g\% ,y/ f 3 um N f HY OB m J J 2 m 3 sm yt am F Mmw Em Jam i F 4 *4 June 20, 1939.

June 20., 1939. J. EMERSON 'GRINDING DEVICE 3 Shens-Sheet 3 Filed Sept.22, 1958 \W. &4 N5 m 0 7 3 I M 7 s 3 5 44 d d oJ 5 N R m 4 mm m "W. VF.m W m N A m. M

. Patented June 20, 1939 UNITED s'rA'rEs PATENT OFFICE v The presentinvention relates to a grinding device and it-particu1arly relates to agrinding device for crankshafts.

Although the present invention will be par- 5 ticuiarly described in itsapplication to the grinding or crankshafts for automotive and similarinternal combustion inventions, it is to be understood that it has abroader application and may be applied to many other uses.

Most crankshafts of automobiles after -substantial wear tend to losetheir desired cylindrical bearing surface and tend to become oval orflat or off-center on one or more portions of the periphery thereof.

It is usually necessary to dismantle the entire engine at substantialcost in order to grind the journals and center them.

when the crankshafts have been removed from the car, it is necessary toset them up upon a relatively complicated machine which will enableproper centering and grinding operations of the bearing portions of saidcrankshaft.

It is among the objects of the present invention to prepare an improvedjournal grinding device which may accurately center and grind andrestore a true peripheral surface to journals of automobile and othercrankshafts without heavy labor costs and without the necessity ofdismantling and/or mounting the entire engine of the automobile. 7

Another object is to provide an improved grinding device which will bereadily applicable to crankshafts without necessitating placement ofsaid crankshafts in a special grinding apparatus with accurate centeringand positioning thereof.

Other objects will be obvious or will appear during the course of thefollowing specification.

In accomplishing the objects of the present in- 0 vention, it has beenfound most satisfactory to.

provide a grinding device which is readily assembled and dismantled andwhich may be assembled in such a way as to. enclose or grasp the journalof the crankshaft without the necessity of dismantling the enginestructure and dismounting the same.

In one form of the invention, a grind ring is provided carrying suitableemery cloth or other abrasive material which grind ring is split and maybe positioned so as to grasp the journal to be ground.

The split portions of the grind ring may have a resilient connection toeach other and may 5 be so constructed as to enable adjustment of thetension and adjustment of the grinding diameter.

The grind wheel is preferably held inside of a drive wheel to which ithas a loose connection and within which it floats, the driving wheel 5being preferably also split and having suitable connections, to a sourceof energy as for example, a belt receiver or grooved periphery.

The rotatable sub-assembly of the grind ring and the driving ring may bemounted in a suit- 10 able hracket serving as a bearing for thesubassembly and which may be placed upon the sub-assembly after thesub-assembly has been positioned upon the surface to be ground.

At the same time, other journals or portions 16 of the crankshaft may besuitably supported so as to enable the sub-assembly, above described, tobe rotated upon thejoumai to be rounded or given its proper contour.

The above and other objects will appear more 20 clearly from thefollowing detailed description when taken in connection with theaccompanying drawings, will illustrate a preferred embodimenti of theinventive idea.

Referring to the drawings:

Figure 1 is a perspective view of the grinding device of the presentinvention with'parts broken away to more clearly show the constructionthereof;

Figure 2 is a transverse sectional view upon 30 the line 2-2 of Figure 1upon enlarged scale, as compared to Figure 1; v

Figure 3 is a transverse sectional view upon the line 3-3 of Figure 2showing the rotating grinding sub-assembly and the manner in which it is35 supported;

Figure 4 is a detailed sectional view of the connection between thesplit portions of the grinding ring upon enlarged scale as compared toFigure 3, more clearly to show the construc- 40 tion;

Figure 5 is a diagrammatic perspective view illustrating how thecrankshaft may be mounted to enable grinding of the journals thereof bythe grinding device of the present application.

Referring to Figures 1 to 5, the crankshaft A is provided with aplurality of journals or bearings B, C, D, E and with the shaft F.

The journal B is the particular journal to be ground in the manner shownin Figure 5.

The grinding device, as best shown in Figure 1, consists of a'grind ringG, a drive ring H, a bearing mount I and support mounts J and K.

The motor L may be located in any desired position to drive theconstruction. 5

Referring specifically to Figures 1 to 3, the

grind ring G consists of two elements I and II which are connected bythe bolts l2 and I8. The ends of the sections I0 and II are in contactat I4 at the bolt I2, but are separated at the ends I5 and I9 at thebolt I3 with the springs I1 pressing said ends I5 and it apart.

The bolts I2 and I3 have heads I1, I8, which are accessible through theopenings I9 and in the lower ring section I I.

The construction of the bolt I3 is more fully shown in Figure 4 and itwill be noted that the ends of the spring I l fit in the recesses 2| and22 of the faces I5, I5 of thegrind ring G.

The grind ring G is also provided with recesses'23 and 24 which have theclamp plates 25, 26= holding the abrasive strips 21 and 28 in position.The ends 29 and 30 of the strips 2i and 28' are free since the grindring G will be turned in the direction indicated by the arrow 3 I.

The journal B is adapted to fit within the opening of the. grind ring Gwhich may be placed thereon by opening or loosening the bolts I2 and I3and then tightening them up after the two halves I0 and II have beenplaced in position on the journal B.

The grind ring G is driven by the drive ring H by the projectingelements or fins 32, 33 and 34 which fit into the recesses 35, 36 and 31in the interior of the drive ring H.

The drive ring H is made up of two half sections 39 and 40 which havethe shoulders M and 42 (see particularly Figure 2) and the lips 43 and44 between which is the groove 45 to receive the belt 46 (see Figures 2and 5) driven by the motor L.

The two segments 39 and 40 are held together by the pins 46 and 41 (seeFigure 3) which pins are in turn held in position by the transverse pins48, 49. 50 and SI. These pins 46 and 41 fit in reoefies in contactingfaces 52 and 53 of the drive ring segments 39 and 40.

The upper segment 39 as shown in Figure 3 is provided with an opening 54into which projects the pin 55 from the segment I0 of the grind ring G.

Through the sides of the opening 54 extend the transverse pins 56 and 51against which the upper end of the pin 55 contacts.

The connection of the pin to the opening 54 and the projections or fins32, 33 and 34 in the slots or recesses 35, 36 and 31 provides a freefloating drive connection between the-grind ring G and the drive ring H.

The support structure I consists of two plates 58 and 59 having circularopenings or recesses therein which are adapted to be placed on andengage the shoulders M, 42 of the outer ring or drive ring H, as shownin Figure 2.

The front end of the recess 60 is open so as to enable more readyassembly of the plates 58 and 59 with the ring sub-assembly G and Hafter said sub-assembly has been placed upon the journal B.

The plates 58 and 59 are held together by the bolts 6|, 62, 63 and 64each of which is provided with a spacer sleeve 65 having the shoulderedend portions 66 fitting in openings in the plates 58 and 59.

Each bolt is provided with a hexagonal head 61 with a washer 68 and awing nut 69 for tightening the same.

It will be noted from Figure 1 that the wing nuts are all positioned onone side except for the bolt 63.

The plates 58 and 59 carry the blocks I0, II having the openings I2, I8and I4 extending entirely through the blocks I0 and II but terminatingat the plates 58 and 49.

These blocks I0 and II areheld in position by the bolts I5 and I5.

The blocks are also provided with set screws or bolts l1, l8 and 19which are designed to clamp in position the structure rods and 8| whichhold the grinding structure in position in respect to the supports J andK.

The supports J and K are in turn provided with the blocks 82 and 83which receive the other ends of the rods 80 and 8!.

The blocks 82 and 83 also receive the uprights at and as.

The uprights are held in position by the set screws 86 and 81. The upperends:of the uprights 84 and 85 support the lower ends and M of thestraps 08 and 89, by the screws 92 and 93.

The straps 88 and 89 have outwardly bent portions 94 and to ends ofwhich are held the straight strap portions 96 and 91 by means of thebolts 98 and 99 having the lock nuts I00 and NH.

As indicated in Figure 5, the recesses I92 and I03 formed between thebends 94 and 95 and the straight strap elements 96 and 91 are designedto receive the journals C and D on the crankshaft structure.

In operation, the segments I0 and II of the grind ring G, 49 and 40 oi.the drive ring H and the plates 58 and 59 are all separated by looseningthe bolts I1 and I8, the pins 46 and 41 and the bolts 6I and 64 allinclusive, prior to placement upon the journal B.

The grinding combination G, H and I has in the meanwhile been dismountedfrom the rods 80 and 8| by loosening the set screws 11 and I9.

The crankshaft, as shown in Figure 5, may have one end I04 clamped inthe vise I05 by the handle I06 and its other end I01 may carry the usualgear I08. The grind ring G is first placed upon the journal B with theemery cloth 2! and 28 in position therein and the bolts I2 and I3 aretightened up.

The bolts H are tightened so that the two faces I4 contact while thebolt I3 is merely tightened until there is sumcient tension on thespring I! to assure that the emery cloth 2! and 281 will grind the faceof the journal upon a true center.

Then, the two segments 39 and 40 of the drive ring H may be attachedwith pins 46 and 41 being in proper position and with the Lin- 55 beingreceived in the recess 54.

The belt 46 may then be attached.

The plates 58 and 59 may then be placed will the edges of the recesses60 upon the shoulders 4| and 42.

Tile bolts 6| and 64 may then be applid'fi connect the plates 59 and 59,then the straight straps 96 and 91 may be loosened by opening the nutsI00 and IM and the journals B and C mw be positioned in the spaces I03and I02.

The straight straps 96 and 91 may be con nected by the nuts I00 and IMto cover the openings I02 and I03 and the bars 80 and 8I are then fixedin position in one of the blocks I0 and II by the set screws 11 and 19.

Then the motor L may be started driving the grind ring H and the drivering G until the grinding has been completed.

Among the important features of the present invention as shown inFigures 1 to 5 are the floating drive resulting from the pin 55 fittingin the opening 54 and. the adjustable resilient connection indicated inFigure 4 which is accessible through the opening I50 in the drive ringH.

By the device as'shown, it is possible to grind the journals of anautomotive crankshaft without removing the crankshaft from the car andit is possible to grind these journals absolutely round without anelaborate centering machine.

Due to the free floating connection 54, 55 there is no direct bearingpressure, which might tend to give anunbalanced grinding.

Moreover, adjustment of the bolts l3 indicated in Figure 4, enables thedeviceto be readily adjusted to meet various conditions.

The journal will be ground accurately in line and on center by reason ofthe device as shown and a great amount of time and labor will be savedbecause dismounting of the automotive engine or motor is. not required.

It is apparent that the specific illustrations shown above have beengiven by way of illustration and not by way of limitation and that thestructures above described are subject to wide variation andmodification without departing from the scope or intent of theinvention, all of which variations and modifications are to be includedwithin the scope of the present invention.

What is claimed is:

1. A grinding device comprising a rotatable grind ring to receiveinteriorly thereof a journal to be ground, a rotatable drive ringencircling and carrying said grind ring, a support for carrying saiddrive ring and means for causing rotation of said drive ring around saidjournal to grind the same, said rings being split so that they may beplaced upon the journal, the split elements of said grind ring beingseparated by a coil spring and a bolt adjustably to draw up said coilspring.

2. A grinding the journals of an automobile crankshaft comprising asplit ring carrying an abrasive material on the interior face thereof tobe placed on and rotated around one of the journals of said shaft,adjustable means to regulate the size of the opening in said ring, asecond split ring encircling said first split ring, free floatingconnections between said split rings to cause said rings to rotatetogether, driving means on said second ring, bearing means on saidsecond ring, a bearing support to receive said bearing means, a secondsupport for the other journals of the crankshaft while said one journalis being ground and connecting means to connect the supports together,said floating connections including projections from the outsideperiphery of the first ring and recesses on the inside periphery of thesecond rin receiving said projections.

3. A grinding device comprising a rotatable device for centering andfacing' grind ring to receive interiorly thereof a journal to be ground,a rotatable drive ring encircling and carrying said grind ring, asupport ior carrying said drive ring and means for causing rotation ofsaid drive ring around said journal to grind the same, said rings beingsplit so that they may be placed upon the journal. said drive ringhaving a radial opening at one side thereof and said grind ring havingan unthreaded'pin projecting thereinto. said opening having parallel rodlike contact members positioned transversely to the direction ofrotation and parallel to the axis of rotation, said unthreaded pin beingpositioned between and contacting with said rod members.

JOHN EMERSON.

